Introduce context class.

2013-07-24  David Malcolm  <dmalcolm@redhat.com>

	Introduce context class.

	* Makefile.in (CONTEXT_H): New.
	(OBJS): Add context.o.
	(toplev.o): Add CONTEXT_H to dependencies.
	(context.o): New.

	* toplev.c (general_init): Create the singleton gcc::context
	instance.

	* context.c: New.

	* context.h: New.

From-SVN: r201230

1 files changed, 42 insertions, 0 deletions

diff --git a/gcc/context.h b/gcc/context.h
new file mode 100644
index 0000000..3caf02f
--- /dev/null
+++ b/gcc/context.h
@@ -0,0 +1,42 @@
+/* context.h - Holder for global state
+   Copyright (C) 2013 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_CONTEXT_H
+#define GCC_CONTEXT_H
+
+namespace gcc {
+
+/* GCC's internal state can be divided into zero or more
+   "parallel universe" of state; an instance of this class is one such
+   context of state.  */
+class context
+{
+public:
+
+  /* Currently empty.  */
+
+}; // class context
+
+} // namespace gcc
+
+/* The global singleton context aka "g".
+   (the name is chosen to be easy to type in a debugger).  */
+extern gcc::context *g;
+
+#endif /* ! GCC_CONTEXT_H */